GNU bug report logs - #15555
24.3; Bidirectional display very slow with long lines

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Package: emacs;

Reported by: Jerome L Quinn <jlquinn <at> us.ibm.com>

Date: Mon, 7 Oct 2013 20:25:01 UTC

Severity: normal

Merged with 3219, 4123, 9589, 13675, 18530, 22143, 24523, 30457, 32523, 40007

Found in versions 23.1, 24.2, 24.2.93, 24.3, 24.5, 26.0.91, 27.0.50, 28.0.50

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

Message #32 received at 15555 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Antipov <antipov <at> dev.rtsoft.ru>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 15555 <at> debbugs.gnu.org
Subject: Re: Re: bug#15555: 24.3; Bidirectional display very slow with long
 lines
Date: Tue, 18 Feb 2014 16:43:52 +0400

[Message part 1 (text/plain, inline)]
On 10/09/2013 08:59 PM, Eli Zaretskii wrote:

> IOW, this is bug #13675, which has nothing to do with bidi.  As long
> as the basic display algorithms are not changed to fix that bug, I'm
> going to claim that bidi is not the issue here.

Hm... I have two files, with 2000 and 4000 first chars extracted from the beginning
of the monster string from http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15555#5.

The following function:

(defun bug15555 ()
  (interactive)
  (while (not (eobp))
    (right-char 1)
    (redisplay)
    (sleep-for 0.01)))

runs smoothly over 2000.txt, but painfully slow over 4000.txt.  The latter
case also shows the very pathological profile with ~25% CPU spent in memcpy.

Are you sure that bidi_copy_it doesn't add one more bottleneck to the whole
stuff?

Dmitry


[2000.txt (text/plain, attachment)]
[4000.txt (text/plain, attachment)]
This bug report was last modified 2 years and 305 days ago.

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